Bearing-surface



' I". E. SPERHY.

BEARING SURFACE. APPLICATION FILED DEC. I, 195- mommaz w QI- "v FRANK EARLSPERRY, OF BATAVIA, ILLINOIS.

BEARING-SURFACE.

Specification of Letters Patent.

Patented June 24, 191).

Application tiled December 1, 1315. Serial No. 64,588.

To all lello/n it 'may concern:

lie, it ltnown that I, FRANK EARL Srnnnr,

citizen of the United States, residing at.

Batavia, in the count)vv of Kane and State .of Illinois, have invented certain new and tion from theI bearing. Fourth, this inven` tion relates to bearing surfaces and has for its object a method of construction of a noiseless clutch relea ir-g shoe for friction clutches. y

M v invention as related to a method of construction of a self lubricating peg bearing surface provides for a bearing surface upon the end grain of a fibrous material, which is filled with a lubricant which dissipates itself upon the bearing surface 'as required automatically, the utilization of the end grain of the fibrous material also adding quality and wearing ability to the bearing surface.

M v invention as related to a non swelling bearing surface relies upon the fact that the fibrous material utilized in the 'construction of this` bearing surface has van inappre limit the diameter of the pegs and the pro trusion of same to the extent that the diame* ter of thepeg shall always be less than 2 times the square root of the protrusion into the diameter of the shaft plus tlie'protrusion. More concisely;

where,

D is the diameter ofthe peg.

l. is the protrusion of the pegs.

l) is the diameter of the shaft.

This relation 'must be adhered to oi dilliculty due to seizureI will be embountered.

H v invention as related to a heat con ducting means .in a fibrous bearing surface relies upon the vfact that I employ a metal retainer which readil)v conducts the heat of friction from the bearing proper and distributes it to other portions of the bod)Y which are in conjunction with-the bearing which in most cases is adapted to 'adiate said heat of friction.v

y invention as related to a noiseless clutcl: releasing` shoe for friction clutches relies upon the utilization of a fibrous material containing a lubricant, and although considerable wear has been attained on the bearing no noise is produced due to the qualities of the fibrous material employed.

lleretofore the bearing of this tvpe, namely, permanentlv lubricated bearings, have e1npl ved as a bearing surface, the grain of the fibrous material running parallel to the surface of the hearing which is readily understood to be the shortest lived as compared with a bearing surface utilizing the end grain of said fibrous material.

The treated plugs described' in the fol-y lowing description and shown in` the, preceding drawing are round in cross-section but need not he so made to perform the same functions.

The principal object and usefulness of this invention is to provide for a bearingwhich remainsI unchanged as to size in all Conditionsl of humidity. t is practicable and desirable also tov utilize permai'icntl)v lubricated bearings where'the same are suhmerged in waterfzmdy whereas heretofore bearings have been v4employed which utilizey the side grain of theflibrous material` and wherea-s the fibrous material employed increased in size laterally the result was in general that the bearing seized or else was made soy loose that it served merely as a guide and not a support as originallyv intended. By the use of my invention it is practical and possible to make a close running fit on all bearings, whether submerged in water or in a drv warm location, without` danger of seizing.

Heretofore bearings of fibrous material containing a lubriant have been solely made up of the fibrous material which has none of the heat conducting` properties so tit) plugs 7 desirable in bearings that. are to be runat high speed therebyv generating considerable heat of friction. If this heat of friction cannot be conducted away sufficiently'fast as in the case of the solid nonconducting fibrous material heretofore utilized, the bearing burns up and is destroyed. By the use of a bearing constructed according to these specifications it is therefore possible to run bearings at highery speeds without danger of burning up due tothe heat conducting qualities of the metal retainer ein# ployed.-

To overcome a source of annoyance in the case of rattling clutch releasing shoes for friction clutches, as is the case where a metal to metal bearing is used, my invention may 'be employed which -allows for the fibrous also'serve as a protection against sand or grit entering the hearing.

Referring to the acompanying sheet of eX- plan'atory drawings z--Figure 1 is a longitudinal cross-section of the common type of bearing bushing'. Fig. 2 is a cross-section at right angles to the axis of the bushing shown in Fig. 1. Fig. 3 is a development of the inner surface of the bushing shown in Fig. 1. Fig. 4 shows a plan ,view of the ordinary type of 'clutch releasing shoe for friction clutchesv Fig. 5 shows a cross-sectionthrough the clutch' releasing shoe shown Re' erri'ng to Figs. 1, 2, and 3 like figures and letters refer to the same parts. The pegs 7 are firmly held in the retainer 6 which is made of metal. The pegs 7 are lirnpregnated with a lubricantand are allowed to prot-rude through the retainer sufficiently y toinsure a full bearing uponthe pegs, also alloivinevr a space that may be filled with solid 1uy 'rcant The holes in the retainer e that receives the lpegs Ihre counter-sunk slightlyV 'as shown to facilitate el'itering the when theyv are pressed in and serves also as a Ameans of securing said 'plugs' from falling through the hole into the inside of the retainer, should the plugs for any reason shrink and become loose in the retainer. This particular type. of bushing is usable in practice merely by pressing it into the body .A or shell that receives the bearing. The

diameter of the shaft is shown at D.

Referring to Figs. 4 and 5 like figures and letters refer to the same parts. The metal retainer in this case is split intotwo pieces such as 8 and 9 and are held together by means of the bolts and nuts 12. The set of pegs l0 shown in full lines are located on.

the pressure side of the shoe While the pegs 11 are used merely to prevent a metal to metal bearing. The pegs in the case of the clutch releasing shoe seat against a shoulder in the retainer so that they do not press flush withv the retainer when the shoe isv placed under pressure.v A small hole completely through the retainer in line with each plug facilitates the removal of said plugs when same become worn down and arein need of replacement. T represents the lwidth of te riding groove for. the clutch releasing s oe.

Having now described my invention, what I claim as new and desire ters Patent is :e

' l. The method of constructing a self lubricating, non-swelling bearing surface, which consists of inserting pegs of fibrous material impregnated with a lubricant, in a to secure by Letinet-al retainer, means for securing .said pegs in said retainer by allowing said pegs to eX- pand at both ends with freedom. l

2. The method of construction of a self lubricating, non-swelling bear-ing surface, which consists of inserting pegs of fibrous material impregnated with a lubricant in a metal retainer, saidpegs projecting to form a bearing surface beyond 'said retainer, and 

